Since the facial bones grow little by little anyway, I think it would be better to make it very slim from the beginning with a wide-mouthed jaw surgery rather than having two or three major surgeries. 
  The jaw masseter muscle is used and developed as people eat food throughout their lives, so the masseter muscle resists the square jaw and naturally creates angles in the square jaw body. There are many real cases on plastic surgeons' blogs.
 To be honest, there are celebrities who were famous for having a wide-mouthed jaw in the beginning, and there are even celebrities who have grown their jaws to some extent and have angles under their ears. So, the contour is usually not done at once. It is said that cases where the jaw grows are more common and fatal than sagging are more common in the contour and it is more fatal. There are many people around me who were naturally shaped and had their jaws grow later, but they had to repeat the college entrance exam three times. I recently had another surgery.